We shall find the molar mass first.
Ca5(PO4)3(OH) = (40 * 5) + 3 (31 + 4(16)) + 16 + 1 = 200 + 285 + 17 = 485 + 17 = 502.
Percent of Calcium = 200/ 502 * 100 = 39.8%
Percent of Phosphorus = 91/502 * 100 = 18.1%
Percent of Hydrogen = 1/502 * 100 = 0.19%
Percent of Oxygen = 100 - (39.8 + 18.1 + 0.19) = 41.91%
12) Ethylene glycol and <span>Diphenylamine
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<span>attached images
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hope this helps!
The answer is A
In approximately 5 billion years, the sun will begin the helium-burning process, turning into a red giant star. When it expands, its outer layers will consume Mercury and Venus, and reach Earth.
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all these are correct:
0 for Mg(s) and H in H2
</span><span>+1 for H in HCl
</span><span>-1 for Cl in HCl
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<span>+2 for Mg in MgCl2
only the first statement is wrong</span>
